/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.foundation.common.config.impl;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

public class IdXmlLoader extends XmlLoader {
    private Map<String, Element> idMap = new HashMap<>();

    public IdXmlLoader(List<String> locationPatternList) {
        super(locationPatternList);
    }

    public IdXmlLoader(List<String> locationPatternList, String suffix) {
        super(locationPatternList, suffix);
    }

    @Override
    protected Element findAndSetExist(Element ele) {
        String id = ele.getAttribute("id");
        if (StringUtils.isEmpty(id)) {
            throw new RuntimeException("id not allow be empty");
        }

        Element existEle = idMap.get(id);
        if (existEle == null) {
            idMap.put(id, ele);
            return null;
        }

        return existEle;
    }
}
